alphagov/whitehall — pull request #262 by matthewford (2013-02-21 16:13:05+00:00)
Title: Allow other editions to be added to a document series

Designs need updating now that document series have more related
edition types.

Changed the expire_on_next_scheduled_publication to take any related
edition

https://www.pivotaltracker.com/story/show/44367311